double-section coal gas cold clean generator: The coal gas of lower section enters into waste heat thermal exchanger after getting dust removed from cyclone deduster. The same time when the coal gas temperature is declining, the coal gas sensible heat is recycled. Then the coal gas enters into draft cooler for further cooling. The lower section coal gas coming out of draft cooler mixes with upper section coal gas from electrical tar and enter into intercoolers for cooling. After the cooling process, coal gas enters into electrical tar for removing light oil and dust; and then get dehydrated through capture drop device and is sent to gas points by pressure-up machine.